R: Reconstruction from a Ridge

gridrec {Rwave} | R Documentation

## Reconstruction from a Ridge

### Description

Reconstructs signal from sample of a ridge, in the Gabor case.

### Usage

    gridrec(gtinput, node, phinode, nvoice, freqstep, scale, Qinv,
    epsilon, np, real=FALSE, check=FALSE)

### Arguments

`gtinput` | Gabor transform, output of `cgt`.
`node` | time coordinates of the ridge samples.
`phinode` | frequency coordinates of the ridge samples.
`nvoice` | number of different frequencies.
`freqstep` | sampling rate for the frequency axis.
`scale` | scale of the window.
`Qinv` | inverse of the matrix Q of the quadratic form.
`epsilon` | coefficient of the Q_2 term in reconstruction kernel
`np` | number of samples of the reconstructed signal.
`real` | if set to TRUE, uses only constraints on the real part of the transform.
`check` | if set to TRUE, computes `cgt` of reconstructed signal.

### Value

Returns a list containing the reconstructed signal and the chained ridges.

`sol` | reconstruction from a ridge.
`A` | <gaborlets,dualgaborlets> matrix.
`lam` | coefficients of dual gaborlets in reconstructed signal.
`dualwave` | array containing the dual gaborlets.
`gaborets` | array of gaborlets located on the ridge samples.
`solskel` | Gabor transform of sol, restricted to the ridge.
`inputskel` | Gabor transform of signal, restricted to the ridge.

### References

See discussions in the text of “Practical Time-Frequency Analysis”.

### See Also

`sridrec`, `gregrec`, `regrec`, `regrec2`.

[Package Rwave version 2.4-8 Index]